US10465600B2 - Control device for internal combustion engine - Google Patents

Control device for internal combustion engine Download PDF

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Publication number
US10465600B2
US10465600B2 US15/572,393 US201515572393A US10465600B2 US 10465600 B2 US10465600 B2 US 10465600B2 US 201515572393 A US201515572393 A US 201515572393A US 10465600 B2 US10465600 B2 US 10465600B2
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Prior art keywords
opening degree
combustion engine
internal combustion
gate valve
full closing
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US15/572,393
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US20180119607A1 (en
Inventor
Takahiko Ono
Junichi Inoue
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F02B37/186—Arrangements of actuators or linkage for bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D23/00—Controlling engines characterised by their being supercharged
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • F02D41/2429—Methods of calibrating or learning
    • F02D41/2451—Methods of calibrating or learning characterised by what is learned or calibrated
    • F02D41/2464—Characteristics of actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • Y02T10/144—

Definitions

  • the present invention relates to a control device for an internal combustion engine (engine) provided with a turbocharger, and more particularly, to a control device configured to apply feedback control to an opening degree of a waste gate valve provided in an exhaust bypass passage of an internal combustion engine so that the opening degree becomes a target opening degree.
  • a waste gate valve for opening/closing an exhaust bypass passage, which is arranged so as to bypass a flow passage of exhaust gas flowing into a turbine.
  • WGV waste gate valve
  • a control device 50 employing an electric actuator 34 incorporating a motor to allow an opening degree of a WGV 31 to be freely set.
  • a control device configured to determine a target opening degree of the WGV 31 for acquiring an optimal supercharging pressure in accordance with an operation state of an internal combustion engine 10 , and to apply feedback control so that the target opening degree of the WGV 31 and an actual opening degree of the WGV 31 detected by a position sensor 53 match each other (e.g., refer to Patent Literature 1).
  • the target opening degree of the WGV 31 is determined based on various types of information indicating the operation state of the internal combustion engine.
  • the target opening degree of the WGV 31 is determined based on map data of a rotation speed NE and a throttle opening degree TA of the internal combustion engine.
  • a position sensor 53 is configured to detect a position of the actuator 34 , and output, as an electric signal, an operation position of the WGV 31 , which opens/closes in association with the actuator 34 .
  • the output voltage of the position sensor 53 is designed so as to increase by Vrng.
  • the fully closed position CP of the WGV 31 may deviate as a result of an assembly tolerance when the WGV 31 and the actuator 34 are connected to each other, a thermal expansion or wear of members, or other causes.
  • an operable range AOR of the actuator 34 is designed so as to be wider than the actuator control range ACR.
  • the position sensor 53 is also configured to output a voltage of from a lowest voltage VL to a highest voltage VH, which are output voltages when the actuator 34 is at both ends of the operable range AOR.
  • a method of controlling the actuator 34 so that the opening degree of the WGV 31 matches the target opening degree there is generally used feedback control of using proportional-integral calculation (PI) based on the target opening degree and the actual opening degree, calculation (PID) of combining the proportional-integral calculation with derivative calculation, or calculation of combining the proportional-integral calculation with feed-forward (FF) calculation.
  • the feedback control is used to automatically correct the operation amount of the actuator 34 so that the target opening degree and the actual opening degree match each other even when a difference occurs between the target opening degree and the actual opening degree, thereby resolving the difference between the target opening degree and the actual opening degree.
  • FIG. 6A to FIG. 6F are time charts for illustrating an example of behaviors of a target opening degree and an actual opening degree of the WGV 31 and respective calculation results when the target opening degree is changed stepwise in accordance with feedback control in which the proportional-integral calculation is combined with the FF calculation.
  • the derivative calculation is omitted.
  • FIG. 6A to FIG. 6F have the time as their horizontal axes in common, and have, as their vertical axes, respective calculation results of behaviors of a target opening degree Sv and an actual opening degree Pv, an integral term, a proportional term, an FF term, a feedback correction amount, and an actuator operation amount in the stated order from the top as waveform charts.
  • Those calculation results are acquired in accordance with Expression (2) and Expression (3).
  • an actuator operation amount Mv[n] is acquired by adding a feedback correction amount ⁇ Mv[n] to a previous value Mv[n ⁇ 1] of an actuator operation amount Mv.
  • the feedback correction amount ⁇ Mv[n] is acquired as a sum of three calculation terms of an integral term acquired by multiplying a difference between a target opening degree Sv[n] and an actual opening degree Pv[n] by an integral gain Ki, a proportional term acquired by multiplying a difference between a current value Pv[n] of the actual opening degree and a previous value Pv [n ⁇ 1] of the actual opening degree by a proportional gain Kp, and an FF term acquired by multiplying a difference between a current value Sv[n] and a previous value Sv[n ⁇ 1] of the target opening degree by an FF gain Kf.
  • Mv [ n ] Mv [ n ⁇ 1]+ ⁇ Mv [ n ] Expression (2) where:
  • the integral term acts to resolve the steady difference between the target opening degree and the actual opening degree.
  • the proportional term acts to decrease the operation amount given by the FF term in accordance with a degree of convergence of the difference between the target opening degree and the actual opening degree.
  • the FF term acts to resolve the difference between the target opening degree and the actual opening degree occurring in accordance with a change amount of the target opening degree when the target opening degree changes.
  • the operation amount of the actuator 34 is corrected through use of the feedback correction amount, which is the sum of the integral term, the proportional term, and the FF term acquired in this way, and the control is applied so that the target opening degree and the actual opening degree of the WGV 31 match each other.
  • the fully closed position of the WGV 31 may deviate resulting from the assembly tolerance when the WGV 31 and the actuator 34 are connected to each other, the thermal expansion or wear of members, and other causes as described above.
  • the fully closed position of the WGV 31 deviates, even in a case where the target opening degree and the actual opening degree in terms of the control match each other, an actual flow rate of the exhaust gas flowing through the exhaust bypass passage 30 deviates, and consequently, the pressure of the intake air to be compressed by the compressor deviates from the desired supercharging pressure.
  • the fully closed position of the WGV opening degree needs to be learned in order to handle the degradation.
  • the following method is employed. Specifically, a condition under which the output voltage of the position sensor 53 becomes the minimum value VL (refer to FIG. 5 ) as a result of an occurrence of a deviation of the fully closed position toward the lower limit side is recognized in advance by measurement or the like. Then, when an internal combustion engine required opening degree, which is determined based on the operation state of the internal combustion engine 10 , is set to 0% (WGV 31 full closing), the target opening degree is replaced by an opening degree acquired by assigning the minimum value VL to Vs of Expression (1) in place of the internal combustion engine required opening degree, thereby carrying out the feedback control.
  • the internal combustion engine required opening degree Seng (represented as the dotted line) changes from 100% to 0% (from 3.5 V to 1.5 V, which is calculated backward in terms of Vs in accordance with Expression (4)).
  • the full closing learning control changes the target opening degree Sv from 0%, which is the internal combustion engine required opening degree Seng, to a full closing learning target opening degree Slrn, which is an opening degree when the position sensor output voltage becomes the minimum value VL due to the occurrence of the deviation toward the lower limit side of the fully closed position.
  • the WGV 31 is pressed against the position at which the exhaust bypass passage 30 is completely closed, and the control device 50 thus determines that the opening degree of WGV 31 stays at ⁇ 10% while providing a protection period as a stop determination period ⁇ T.
  • the reason for providing the stop determination period ⁇ T is to prevent a determination error in the learning of the true fully closed position, and is set in order to positively determine the state in which the WGV opening degree Pv does not move continues for ⁇ T, which is the predetermined period, through use of the output voltage Vs of the position sensor 53 .
  • the full closing learned position is not updated at a time t 3 between the time t 2 and a time t 4 , at which the stop determination period ⁇ T has not elapsed.
  • the full closing learned position Vmin is then updated from 1.5 V to 1.3 V, and the full closing learning control is finished.
  • the internal combustion engine target opening degree Seng is also returned to 0%, which is the original internal combustion engine required opening degree, at the time t 4 .
  • the fully closed position of the WGV 31 is updated to the correct position by applying the full closing learning control described above.
  • the flow rate of the exhaust gas flowing through the exhaust bypass passage 30 is prevented from deviating, and the degradation in the controllability of the supercharging pressure is thus avoided.
  • the actuator operation amount immediately after the update of the learned position does not need to be changed from the operation amount calculated at the control timing immediately before, and only needs to be held to be the operation amount calculated at the previous calculation timing.
  • the target opening degree and the converted value of the actual opening degree have changed as a result of the update of the full closing learned position and the switching of the target opening degree, and thus the proportional term and the FF term generate the unnecessary values as described above, and those values are added to the feedback correction amount, which acts to move the operation position of the WGV 31 .
  • the feedback correction amount ⁇ Mv is added to the actuator operation amount, and the actual opening degree fluctuates as indicated as “X” in FIG. 7 .
  • the full closing learning control is finished before the full closing learned position Vmin is updated.
  • the target opening degree is retuned from ⁇ 20%, which is the target opening degree of the full closing learning, to 5%, which is the internal combustion engine required opening degree Seng.
  • the full closing learned positions, the target opening degrees, and the actual opening degrees before and after the change take values of Table 2.
  • the actual opening degree of ⁇ 10% immediately before the end of the full closing learning control only needs to be fed back to the target opening degree of 5% immediately after the full closing learning control.
  • the same feedback correction amount ⁇ Mv as that in a case where the target opening degree Sv changes by 15% from the state where the target opening degree Sv and the actual opening degree Pv match each other only needs to be generated.
  • the present invention has been made in view of the above-mentioned problem, and therefore has an object to provide a control device for an internal combustion engine, which is capable of preventing an opening degree of a WGV from deviating from a target opening degree due to unnecessary feedback calculation amounts calculated at a control timing at which full closing learning control for learning a fully closed position of the WGV opening degree is finished.
  • a control device for an internal combustion engine which is configured to: input information on an operation state of the internal combustion engine and information on a position of an actuator configured to control an opening degree of a waste gate valve provided in an exhaust bypass passage of the internal combustion engine; acquire an internal combustion engine required opening degree of the waste gate valve based on the operation state; and apply feedback control to the actuator while the internal combustion engine required opening degree is set as a target opening degree of the waste gate valve, in which, when the internal combustion engine required opening degree is full closing, full closing learning control is carried out by converting the target opening degree of the waste gate valve to a target opening degree for full closing learning so that the waste gate valve is brought into a fully closed state in which the waste gate valve fully closes the exhaust bypass passage, and when a state in which the position of the actuator does not change consequently continues for a set period, it is considered that the fully closed state is brought about and the full closing learning is finished, and a correction amount for the feedback
  • the control device for an internal combustion engine is configured to convert the target opening degree of the waste gate valve to the target opening degree for the full closing learning so that the waste gate valve is brought into the fully closed state when the internal combustion engine required opening degree is the full closing, consider that the fully closed state is brought about and the full closing learning control is finished when the state in which the position of the actuator does not change continues for the set period, and decrease the correction amount of the feedback control at this time point.
  • the opening degree of the waste gate valve can be prevented from deviating from the target opening degree due to the unnecessary feedback calculation amounts calculated before and after the control timing at which the full closing learning control for learning the full closing learned position of the waste gate valve opening degree is finished.
  • FIG. 1 is a configuration diagram for illustrating an entire system of a hitherto-known internal combustion engine to which a control device for an internal combustion engine according to a first embodiment of the present invention is applied.
  • FIG. 2 is a functional block diagram for illustrating the control device for an internal combustion engine according to the first embodiment of the present invention.
  • FIG. 3 is a flowchart for illustrating an operation of the control device for an internal combustion engine according to the first embodiment of the present invention.
  • FIG. 4 is a flowchart for illustrating an operation of a control device for an internal combustion engine according to a second embodiment of the present invention.
  • FIG. 5 is a characteristic graph for showing a relationship between an operation position of an actuator and an output voltage of a position sensor.
  • FIG. 6 are time charts for illustrating a behavior of an actual opening degree of a WGV and respective feedback control calculation terms when a target opening degree of the WGV is changed stepwise in accordance with feedback control.
  • FIG. 7 is a time chart for illustrating a method of learning a fully closed position of a WGV opening degree, and a problem that arises when execution of the full closing learning control is finished.
  • FIG. 1 is a diagram for illustrating a configuration of an internal combustion engine system to which a control device for an internal combustion engine according to a first embodiment of the present invention is applied.
  • an air cleaner 12 is mounted to an inlet of an intake passage 11 of an internal combustion engine 10 .
  • An airflow sensor 51 for detecting an intake air amount is provided on a downstream side of the air cleaner 12 .
  • a turbocharger 20 is provided on a downstream side of the airflow sensor 51 .
  • the turbocharger 20 includes a compressor 201 and a turbine 202 .
  • the compressor 201 and the turbine 202 are integrally coupled to each other through a coupling shaft.
  • the compressor 201 is rotationally driven through energy of exhaust gas input to the turbine 202 .
  • An intercooler (IC) 13 for cooling the compressed air is arranged on a further downstream side of the compressor 201 .
  • a throttle valve 14 is arranged on a further downstream side of the intercooler 13 .
  • a throttle upstream pressure sensor 52 for detecting a pressure of intake air supercharged by the turbocharger 20 is provided between the intercooler 13 and the throttle valve 14 .
  • an exhaust system of the internal combustion engine 10 is provided with an exhaust passage 15 .
  • the turbine 202 of the turbocharger 20 is provided in the course of the exhaust passage 15 .
  • the exhaust passage 15 is provided with an exhaust bypass passage 30 for bypassing the turbine 202 , thereby connecting input and output sides of the turbine 202 .
  • a WGV 31 serving as an exhaust bypass valve is arranged.
  • an exhaust gas purification catalyst 16 for purifying the exhaust gas is provided on a downstream side of the turbine 202 .
  • the WGV 31 arranged in the exhaust bypass passage 30 is mechanically connected to one end of a joint member 32 . Another end of the joint member 32 is mechanically connected to an output shaft 33 of an actuator 34 serving as an exhaust bypass valve drive device.
  • a position sensor 53 for detecting position information on the actuator 34 which correlates with an open position of the WGV 31 , is provided in a vicinity of the actuator output shaft 33 .
  • the position sensor 53 is separated from the actuator 34 , but may be integrated into the actuator 34 .
  • control device for an internal combustion engine includes a control device 50 .
  • the control device 50 drives the above-mentioned various types of actuators based on the above-mentioned various types of input information, thereby optimally controlling a combustion state and an output torque of the internal combustion engine 10 .
  • a motor capable of rotating forward and backward is integrated into the actuator 34 , and an actuator output shaft 33 for converting a rotational motion of this motor to a translational motion and outputting the translational motion is provided to the actuator 34 .
  • This actuator output shaft 33 is movable in its axial direction in accordance with a current supply direction of the motor.
  • the WGV 31 can be moved toward an open side (left side of FIG. 1 ) via the joint member 32 .
  • the WGV 31 can be moved toward a closed side (right side of FIG. 1 ) via the joint member 32 .
  • the position sensor 53 is provided in a vicinity of a side part of the actuator output shaft 33 , and a position in the axial direction of the actuator output shaft 33 detected by this position sensor 53 is input as an operation position of the WGV 31 , namely, the operation position of the WGV 31 , to the control device 50 .
  • FIG. 2 is a block diagram for illustrating the control device 50 for an internal combustion engine according to the first embodiment of the present invention illustrated in FIG. 1 .
  • FIG. 7 a description is given of a configuration and an operation relating to basic control of the WGV 31 .
  • An internal combustion engine required opening degree determination unit 501 is configured to input, in addition to the number of revolutions and a throttle opening degree of the internal combustion engine, a plurality of pieces of information indicating the operation state of the internal combustion engine, for example, the intake air amount detected by the airflow sensor 51 and the supercharging pressure detected by the throttle upstream pressure sensor 52 , and to determine an internal combustion engine required opening degree Seng of the WGV 31 based on those pieces information.
  • This is a publicly-known technology.
  • a target opening degree setting unit 502 is configured to set the internal combustion engine required opening degree Seng determined by the internal combustion engine required opening degree determination unit 501 as a target opening degree Sv of the WGV 31 .
  • An actual opening degree conversion unit 503 is configured to input an electric signal Vs representing an operation position of the WGV 31 detected by the position sensor 53 .
  • the actual opening degree conversion unit 503 is configured to convert the operation position of the WGV 31 detected by the position sensor 53 to an actual opening degree Pv based on this position signal Vs and a full closing learned position Vmin of the WGV 31 .
  • a feedback correction amount calculation unit 504 is configured to carry out feedback control at each predetermined calculation timing based on the target opening degree Sv set by the target opening degree setting unit 502 and the actual opening degree Pv obtained by conversion by the actual opening degree conversion unit 503 , thereby calculating a feedback correction amount ⁇ Mv for correcting an actuator operation amount Mv.
  • An actuator operation amount calculation unit 505 is configured to add an actuator operation amount Mv[n ⁇ 1] output from an actuator drive unit 506 at a previous calculation timing and the feedback correction amount ⁇ Mv calculated by the feedback correction amount calculation unit 504 to each other, thereby calculating an actuator operation amount Mv[n] to be output to the actuator at a current control timing (refer to Expression (2)).
  • the actuator drive unit 506 is configured to output the actuator operation amount Mv[n] calculated by the actuator operation amount calculation unit 504 to the actuator 34 , and the actuator 34 is driven in accordance with the actuator operation amount Mv[n].
  • the operation amount of the actuator 34 is a parameter for instructing a current supply direction and a current supply amount of the motor integrated into the actuator 34 , and is given by, for example, a PWM signal (e.g., on-duty signal ranging from ⁇ 100% to +100%).
  • a PWM signal e.g., on-duty signal ranging from ⁇ 100% to +100%).
  • a full closing learning control unit 507 is configured to determine whether or not the internal combustion engine required opening degree Seng determined by the internal combustion engine required opening degree determination unit 501 is 0% (that is, a full closing request). As a result, when the internal combustion engine required opening degree Seng is 0%, the full closing learning control unit 507 issues an instruction to the target opening degree setting unit 502 so as to set a full closing learning target opening degree Slrn as the target opening degree of the WGV 31 in place of the internal combustion engine required opening degree Seng.
  • the target opening degree setting unit 502 When the target opening degree setting unit 502 receives the instruction to set the full closing learning target opening degree Slrn as the target opening degree Sv of the WGV 31 , the target opening degree setting unit 502 switches the target opening degree Sv from the internal combustion engine required opening degree Seng to the full closing learning target opening degree Slrn, and outputs the target opening degree Sv to the feedback correction amount calculation unit 504 .
  • the internal combustion engine required opening degree Seng determined by the internal combustion engine required opening degree determination unit 501 is no longer 0%
  • the switching instruction for the target opening degree Sv directed to the target opening degree setting unit 502 is canceled, and the target opening degree setting unit 502 returns the target opening degree Sv to the internal combustion engine required opening degree Seng to reset the target opening degree Sv.
  • the full closing learning control unit 507 is configured to determine whether or not the output voltage Vs of the position sensor 53 has continued to be constant for a stop determination period ⁇ T while the actuator 34 is being driven for the target opening degree Sv switched to the full closing learning target opening degree Slrn.
  • the full closing learning control unit 507 determines that the WGV 31 is pressed against a true fully closed position when a state in which the output voltage Vs of the position sensor 53 is constant continues for the stop determination period ⁇ T or more. This state corresponds to “end of the full closing learning control”.
  • the full closing learning control unit 507 cancels the switching instruction for the target opening degree Sv directed to the target opening degree setting unit 502 , and issues to the actual opening degree conversion unit 503 an instruction to update the current output voltage Vs of the position sensor 53 as the full closing learned position Vmin.
  • the actual opening degree conversion unit 503 receives the instruction to update the full closing learned position Vmin
  • the actual opening degree conversion unit 503 updates the current output voltage Vs of the position sensor 53 as the full closing learned position Vmin.
  • the actual opening degree conversion unit 503 converts, as the updated full closing learned position Vmin, the output voltage Vs of the position sensor 53 to the opening degree Pv of the WGV 31 .
  • the full closing learning control unit 507 instructs the actual opening degree conversion unit 503 to update the full closing learned position Vmin, and simultaneously issues to the feedback correction amount calculation unit 504 an instruction to decrease the feedback correction amount ⁇ Mv to be calculated at the current calculation timing.
  • the feedback correction amount calculation unit 504 internally decreases the feedback correction amount ⁇ Mv to be calculated at the current control timing.
  • a flow of FIG. 3 basically corresponds to the above-mentioned functions of FIG. 2 .
  • Step S 101 in addition to the number of revolutions and the throttle opening degree of the internal combustion engine 10 , the plurality of pieces of information indicating the operation state of the internal combustion engine 10 , for example, the intake air amount detected by the airflow sensor 51 and the supercharging pressure detected by the throttle upstream pressure sensor 52 , are read.
  • Step S 102 the internal combustion engine required opening degree Seng of the WGV 31 is determined based on the various pieces of information on the operation state of the internal combustion engine 10 read in Step S 101 . Then, in Step S 103 , the detected voltage Vs of the position sensor 53 is read.
  • Step S 104 whether or not the internal combustion engine required opening degree Seng determined in Step S 102 is 0%, that is, whether or not there is a full closing request, is determined.
  • the operation proceeds to Step S 105 , and a full closing learning flag F is set to 0.
  • the operation proceeds to Step S 106 , and the full closing learning flag F is set to 1.
  • Step S 107 the state of the full closing learning flag F is determined.
  • F is 0 (in a case of NO)
  • the operation proceeds to Step S 108 .
  • F is 1 (in a case of YES)
  • the operation proceeds to Step S 114 .
  • Step S 107 when F is 0 (in the case of NO), the internal combustion engine required opening degree is not 0%. Thus, the full closing learning control is not carried out, and respective pieces of processing of Steps S 108 to S 111 are carried out.
  • Step S 108 the internal combustion engine required opening degree Seng is set as the target opening degree Sv.
  • Step S 109 a counter C is cleared to 0.
  • the counter C is a counter used to determine the stop determination period ⁇ T of the WGV 31 when the full closing learning is carried out, and is not necessary when the full closing learning flag F is 0. However, the counter C is cleared to 0 by way of precaution.
  • Step S 110 the output voltage Vs of the position sensor 53 is converted to the actual opening degree Pv based on the current full closing learned position Vmin in accordance with the above-mentioned map of FIG. 5 .
  • Step S 111 the feedback correction amount ⁇ Mv is calculated based on the target opening degree Sv (Sv is currently Seng) set in Step S 108 , the actual opening degree Pv obtained by conversion in Step S 110 , and the previous values thereof in accordance with Expression (3).
  • Step S 112 the actuator operation amount Mv[n] is calculated from the previous value Mv[n ⁇ 1] of the actuator operation amount and the feedback correction amount ⁇ Mv calculated in Step S 111 in accordance with Expression (2).
  • Step S 113 the actuator operation amount Mv[n] calculated in Step S 112 is output to the actuator 34 , and the processing at the current calculation timing is exited.
  • Step S 107 when F is 1 (in the case of YES), the internal combustion engine required opening degree Seng is 0%.
  • respective pieces of processing of the present invention of Steps S 114 to S 123 are carried out as processing for carrying out the full closing learning control.
  • the target opening degree Slrn for the full closing learning is set as the target opening degree Sv, and the operation proceeds to Step S 115 .
  • the target opening degree Slrn for the full closing learning is an opening degree acquired from VL, which is the minimum value of the output voltage Vs of the position sensor 53 as a result of the deviation of the fully closed position toward a lower limit side, and, as illustrated in FIG. 7 , is the target opening degree used to carry out the feedback control so as to positively press the WGV 31 at the operation position at which the exhaust bypass passage 30 is completely closed irrespective of the true fully closed position Vmin in the variation range.
  • Step S 115 it is determined whether or not the absolute value of a difference between the current value of the output voltage of the position sensor 53 and Vs detected a predetermined period before is less than a set value. This is processing of determining whether or not
  • Step S 116 the counter C is cleared to 0, and the operation proceeds to Step S 118 .
  • is less than the set value (in a case of YES), Vs is considered to have no longer substantially changed, and the operation thus proceeds to Step S 117 .
  • Step S 117 the counter C is incremented by 1, and the operation proceeds to Step S 118 .
  • Step S 118 it is determined whether or not the state in which
  • Steps S 115 to S 118 has a purpose of determining whether or not the period in which the opening degree of the WGV 31 stops at a certain degree and no longer changes exceeds ⁇ T under the state in which the feedback control is being applied to the opening degree of the WGV 31 toward the target opening degree Slrn for the full closing learning.
  • Step S 118 it is determined whether or not the count of the counter C is equal to or more than the stop determination period ⁇ T.
  • the count of the counter C is not equal to or more than the stop determination period ⁇ T (in a case of NO)
  • the WGV 31 is determined to have not been pressed against the true fully closed position yet, and the operation proceeds from Step S 118 to Steps S 110 to S 113 .
  • Step S 118 when the count of the counter C is equal to or more than the stop determination period ⁇ T (in a case of YES), the WGV 31 is determined to be pressed against the true fully closed position, and the operation proceeds to Steps S 119 to S 123 , and then to Steps S 112 and S 113 .
  • Step S 119 the incremented counter C is cleared to 0.
  • Step S 120 the target opening degree Sv is returned to the internal combustion engine required opening degree Seng.
  • Step S 121 the full closing learned position Vmin is updated to the output voltage Vs of the position sensor 53 .
  • Step S 122 the output voltage Vs of the position sensor 53 is converted to the actual opening degree Pv based on the full closing learned position Vmin updated in Step S 121 .
  • Step S 123 the processing of decreasing the feedback correction amount ⁇ Mv, which is to be originally calculated, is carried out.
  • ⁇ Mv is set to 0.
  • the integral term of Expression (3) is 0, and all of the proportional term and the FF term are also set to 0.
  • Step S 104 The processing of Steps S 119 to S 123 continues while it is determined in Step S 104 that the internal combustion engine required opening degree Seng is 0%.
  • the operation proceeds in a sequence of Steps S 104 , S 105 , S 107 , and S 108 , and the processing of Steps S 119 to S 123 is no longer carried out.
  • the full closing learned position Vmin is updated, the target opening degree Sv is switched to the internal combustion engine required opening degree Seng as a result of the update of the full closing learned position Vmin, and further, the feedback correction amount ⁇ Mv is decreased.
  • the unnecessary feedback correction amount is decreased, which is calculated at the control timing at which the learning control for the fully closed position of the WGV opening degree is finished, and the WGV opening degree is prevented from deviating from the target opening degree.
  • the pressure of the intake air compressed by the compressor is prevented from deviating from the desired supercharging pressure.
  • a system configuration diagram of the internal combustion engine to which the control device for an internal combustion engine according to the second embodiment of the present invention is applied and a functional block diagram for illustrating the control device for an internal combustion engine are the same as FIG. 1 and FIG. 2 , respectively.
  • the operation of FIG. 2 is different. Specifically, when the internal combustion engine required opening degree Seng is no longer the full closing of 0% before the stop determination period ⁇ T elapses, the full closing learning control unit 507 instructs the target opening degree setting unit 502 to return the target opening degree Sv to the internal combustion engine required opening degree Seng. Then, the full closing learning control unit 507 issues an instruction to decrease the correction amount of the feedback control to the feedback correction amount calculation unit 504 .
  • FIG. 4 is a flowchart for illustrating the operation of the control device for an internal combustion engine according to the second embodiment of the present invention.
  • Steps S 101 to S 123 are the same as those of the above-mentioned flowchart of FIG. 3 for illustrating the operation of the control device for an internal combustion engine according to the first embodiment, and a detailed description of Steps S 101 to S 123 is therefore omitted.
  • Step S 201 which is a decision block, is added between Steps S 108 and S 109 of FIG. 3 .
  • One exiting arrow of the decision block of Step S 201 is connected to Step S 109 , and the other exiting arrow is connected to Step S 202 , which is newly added, thereby allowing the processing of Steps S 202 to S 204 to be carried out.
  • an exiting arrow of Step S 204 is connected to Step S 112 .
  • Step S 107 the state of the full closing learning flag F is determined, and when F is 0 (in the case of NO), the operation proceeds to Step S 108 .
  • Step S 107 when F is 0 (in the case of NO), the internal combustion engine required opening degree is not 0%, and the full closing learning control is thus not carried out.
  • the operation then proceeds to Step S 108 , and, in Step S 108 , the internal combustion engine required opening degree Seng is set as the target opening degree Sv.
  • Step S 108 the processing of Step S 201 is carried out.
  • the determination of “YES” made in Step S 201 means that the internal combustion engine required opening degree Seng becomes no longer the full closing of 0% before the stop determination period ⁇ T elapses after the full closing learning control starts as a result of the state in which the internal combustion engine required opening degree Seng becomes 0%.
  • the internal combustion engine required opening degree Seng becomes no longer 0% before the full closing learned position Vmin is updated, and the full closing learning control is consequently finished.
  • Step S 201 when the determination of “YES” is made, the operation proceeds from Step S 201 to Step S 202 .
  • Step S 202 as in Step S 109 , the counter C is cleared to 0.
  • Step S 203 as in Step S 110 , the output voltage Vs of the position sensor 53 is converted to the actual opening degree Pv, and the operation proceeds to Step S 204 .
  • Step S 204 as in Step S 123 , the feedback correction amount ⁇ Mv is decreased.
  • ⁇ Mv is also set to 0 as in the first embodiment.
  • the feedback correction amount ⁇ Mv is decreased, which is calculated immediately after the full closing learning control is finished as a result of the state in which the internal combustion engine required opening degree becomes no longer 0% before the full closing learned position Vmin is updated after the full closing learning control starts.
  • Step S 204 the operation proceeds to Steps S 112 to S 113 .
  • Step S 201 when a determination of “NO” is made, the same processing as that of Steps S 109 to S 113 of FIG. 3 is carried out, and the processing is then exited.
  • the unnecessary feedback correction amount is decreased, which is calculated at the control timing at which the learning control for the fully closed position of the WGV opening degree is finished, and the WGV opening degree is prevented from deviating from the target opening degree.
  • the pressure of the intake air compressed by the compressor is prevented from deviating from the desired supercharging pressure.
  • Step S 123 and S 204 of FIG. 3 and FIG. 4 the feedback correction amount ⁇ Mv in the form of the sum of the respective calculation terms, which are the integral term, the proportional term, and the FF term, is set to 0.
  • feedback gains an integral gain Ki, a proportional gain Kp, and an FF gain Kf
  • the respective calculation terms may then be calculated.
  • Step S 204 of FIG. 4 15% of the integral term out of the above-mentioned integral term, proportional term, and FF term may be retained, and only the gain Kp of the proportional term and the gain Kf of the FF term may be set to 0.
  • the feedback gains may be switched to such small values that the occurrence of the fluctuation of the actual opening degree, which is the problem, is suppressed to a permissible level, thereby calculating the respective calculation terms.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Supercharger (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
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JP6173523B1 (ja) * 2016-04-26 2017-08-02 三菱電機株式会社 内燃機関の制御装置
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CN107614846B (zh) 2020-05-05
US20180119607A1 (en) 2018-05-03
CN107614846A (zh) 2018-01-19

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